Tubulous steam-generator.



No. 743,316. PATENTED NOV. 3, 1903. J. MGKBGHNIB. TUBULOUS STEAM GENERATOR.

APPLIOATION FILED sun. 6, 1903.

110 MODEL.

INVENTOR w wm WITNESSES.

NITED STATES Patented November 3, 1903.

PATENT OFFICE.

JAMES MCKECHN IE, OF BARROW-IN-FURNESS, ENGLAND, ASSIGNOR TO 'VICKERS SONS AND MAXIM, LIMITED, OF SHEFFIELD, ENGLAND,

TUBULOUS STEAM-GENERATOR.

SPECIFICATION formingpart of Letters Patent No. 743,316, dated November 3, 1903.

Original application filed December 24. 1901, Serial No. 87,101. Divided and this application filed March 6,1903. Serial No. 146,522. (No model.)

To aZZ whom it may concern:

Be it known that I, JAMES MCKECHNIE, a subject of His Majesty the King of Great Britain, residing at Barrow-in-Furness, in the county of Lancaster, England, have invented a certain new and useful Improvement in Tubulous Steam-Generators,of which the following is a specification.

In a specification filed by me on December 24:, 1901, under Serial No. 87,101, are described certain improvements in the construction of tubulous steam-generators; and the present application, which is a division from said specification, relates to the means employed for mounting and enabling the tubular elements to be withdrawn from steam-generators.

In the accompanying drawings, Figure 1 is a sectional plan view of an element consisting of two tubes mounted in a divided header. Fig. 2 is across-sectional elevation on line a 2.

Each element consists of an outer tube 1, closed at its inner end and open at its outer end to the header 2, and of an inner tube 3, open at its inner end to tube 1 and at its outer end to the outer side of the header. The inner tube 3 isshown as being provided witha bell-mouthed attachment 4 for connection to division-plate 5 of header 2; but this method of connection forms no part of the present invention.

To support the inner tube 3 at its free end it carries brackets 8, of which three are shown, although more may be employed. Each bracket carries a segment 6, which segments together form a hemispherical shell adapted to fit the curvature of the inner end of the outer tube 1 and exerting a slight spring-pressure thereon, so that not only will the segments center and hold the inner tube 3, but when the latter is withdrawn through the hand-holes in the header 2 the segments will act as scrapers for the interior of tube 1, their form and method of mounting allowing them to adhere closely to the walls of the tube and yet to yield to and pass any indentation or irregularity therein, which eifect is not obtainable with a simple shell, such as has been heretofore proposed.

The outer tube 1 is secured in header 2 by expanding in the usual way; but it is also provided with an inner circular notch or recess 7, the projecting edge of which is preferably about on a line with the interior rear face of the tube. This construction enables the tube tobe readily gripped when it is desired to withdraw same and renders it unnecessary to increase the size of the opening in the header above that required by the external diameter of tube 1, and this would not be the case if an external flange were employed, while if the tube be lengthened, so as to admit of gripping-holes to be made outside the joint, the lengthened portion would considerably reduce the area of the upcast portion of the header.

What is claimed is- 1. In tubulous steam-generators, the combination with concentrically-arranged steamgenerating and water-circulating tubes, of means for scraping the outer or steam-generating tube and centering the inner or watercirculating tube, comprising three or more segments forming together a hemispherical shell, and brackets attached to same and to the inner tube.

2. In tubulous steam-generators of the class having concentrically-arranged steam-generating and water-circulating tubes, the combination with a header, of a tube carried by same, and forming the outer or steam-generating' tube, and terminating at the interior rear face of said header, said tube having an internal circular notch for withdrawing it, located approximately inside the lines of the rear wall of said header.

In testimony whereof I have hereunto set my hand in the presence of two subscribing witnesses.

JAMES MOKEOI-INIE.

Witnesses:

JAMES HADDow, GEORGE ATKINSON.

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